<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul
          class="cart-list"
          v-for="(cartInfo, index) in cartInfoList"
          :key="cartInfo.id"
        >
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="cartInfo.isChecked == 1"
              @input="checkedCart(cartInfo.isChecked, cartInfo.skuId)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl" />
            <div class="item-msg">
              {{ cartInfo.skuName }}
            </div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ cartInfo.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a
              href="javascript:void(0)"
              class="mins"
              @click="handler(cartInfo, -1)"
              >-</a
            >
            <input
              autocomplete="off"
              type="text"
              :value="cartInfo.skuNum"
              minnum="1"
              class="itxt"
              @input="handler(cartInfo, 0, $event.target.value * 1)"
            />
            <a
              href="javascript:void(0)"
              class="plus"
              @click="handler(cartInfo, 1)"
              >+</a
            >
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ cartInfo.skuNum * cartInfo.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a @click="deleteGoods(cartInfo.skuId)" class="sindelet">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input
          class="chooseAll"
          type="checkbox"
          :checked="checkedAll"
          @change="shopCartCheckedAll"
        />
        <span>全选</span>
      </div>
      <div class="option">
        <a href="#none" @click="deleteSelectGoods">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ totalPrices.num }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrices.prices }}</i>
        </div>
        <div class="sumbtn">
          <!-- <a class="sum-btn" href="###" target="_blank">结算</a> -->
          <router-link class="sum-btn" to="/Trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from "vuex";
import throttle from "_lodash@4.17.21@lodash/throttle";
export default {
  name: "ShopCart",
  mounted() {
    this.getShopCartData();
  },
  methods: {
    //获取购物车商品信息
    getShopCartData() {
      this.$store.dispatch("shopCart/getShopCartInfo");
    },
    //全选
    shopCartCheckedAll(event) {
      let promiseAll = this.$store.dispatch(
        "shopCart/shopCartCheckedAll",
        event.target.checked
      );
      promiseAll
        .then(() => {
          this.getShopCartData();
        })
        .catch((err) => {
          console.log(err);
        });
    },
    //删除选中的商品
    deleteSelectGoods() {
      let promiseAll = this.$store.dispatch("shopCart/deleteSelectGoods");
      promiseAll
        .then(() => {
          this.getShopCartData();
        })
        .catch((err) => {
          console.log(err);
        });
    },
    //商品勾选状态,防止用户过快操作，使用节流
    checkedCart: throttle(function (checked, id) {
      let isChecked = !checked ? 1 : 0;
      let promise = this.$store.dispatch("shopCart/getCheckCart", {
        skuId: id,
        isChecked,
      });
      promise
        .then(() => {
          this.getShopCartData();
        })
        .catch((err) => {
          console.log(err);
        });
    }, 500),
    //商品数量变化 防止用户过快操作，使用节流
    //flag -1 商品数量-1 +1 商品数量加1 0商品数量自定义输入
    handler: throttle(function (cartInfo, flag, num) {
      let skuNum = cartInfo.skuNum;
      let skuId = cartInfo.skuId;
      let disNum = 0;
      switch (flag) {
        //商品减1
        case -1:
          if (skuNum > 1) {
            disNum--;
          } else {
            disNum = 0;
          }
          break;
        //商品+1
        case 1:
          disNum++;
          break;
        //商品数量自定义
        case 0:
          if (!isNaN(num) && num >= 1) {
            disNum = parseInt(num) - skuNum;
          } else {
            disNum = 0;
          }
          break;
        default:
          break;
      }
      //修改购物车商品数量跟商品添加到购物车同一个请求
      this.$store
        .dispatch("detail/addOrUpdateShopCart", {
          skuId: skuId,
          skuNum: disNum,
        })
        .then(() => {
          //当修改购物车商品数量成功时,重新刷新购物车组件
          this.getShopCartData();
        })
        .catch((err) => {
          console.log(err);
        });
    }, 500),
    //删除购物车商品
    deleteGoods(id) {
      let promise = this.$store.dispatch("shopCart/getDeleteGoods", id);
      promise
        .then(() => {
          //请求成功，刷新购物车组件，获取最新商品数据
          this.getShopCartData();
        })
        .catch((err) => {
          console.log(err);
        });
    },
  },
  computed: {
    ...mapGetters("shopCart", ["getCartInfoList"]),
    //购物车信息
    cartInfoList() {
      return this.getCartInfoList.cartInfoList || [];
    },
    //总价和商品总数
    totalPrices() {
      let prices = 0;
      let num = 0;
      this.cartInfoList.forEach((item) => {
        prices += item.skuNum * item.skuPrice;
        num++;
      });
      return { prices, num };
    },
    //every  遍历数据有一个不等于1就返回false
    checkedAll() {
      return this.cartInfoList.every((item) => {
        return item.isChecked == 1;
      });
    },
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 20.8333%;

          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
          a:hover {
            color: red;
            cursor: pointer;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>